Difficulties with std.variant.Algebraic

[bearophile]

> Nullable!(int, 0) unreliable2(in int val) pure nothrow {
>     if (val == 0) {
>         return typeof(return)();
>     } else {
>         return typeof(return)(val);
>     }
> }

Sorry, I meant:

import std.typecons;

Nullable!int unreliable1(in int val) pure nothrow {
     if (val == 0) {
         return typeof(return)();
     } else {
         return typeof(return)(val);
     }
}

Nullable!(int, 0) unreliable2(in int val) pure nothrow {
     return typeof(return)(val);
}

void main() {
     auto nx1 = unreliable1(10);
     auto nx2 = unreliable2(10);
}

Bye,
bearophile